PHP - Get emails address from string

PHP-get-emails-from-string.php

<?php


function extract_emails($str){
		$regexp = '/([a-z0-9_\.\-])+\@(([a-z0-9\-])+\.)+([a-z0-9]{2,4})+/i';
    preg_match_all($regexp, $str, $m);
    return isset($m[0]) ? $m[0] : array();
}

$test_string = 'This is a test string...
        				[email protected]
        				
        				Test different formats:
        				[email protected];
        				<a href="[email protected]">foobar</a>
        				<[email protected]>

        				strange formats:
        				[email protected]
        				test6[at]example.org
        				[email protected]
        				test8@ example.org
        				test9@!foo!.org
        				foobar';

print_r(extract_emails($test_string));


?>